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crypto: ccree - unmap buffer before copying IV

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commit c139c72e2b upstream.

We were copying the last ciphertext block into the IV field
for CBC before removing the DMA mapping of the output buffer
with the result of the buffer sometime being out-of-sync cache
wise and were getting intermittent cases of bad output IV.

Fix it by moving the DMA buffer unmapping before the copy.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Fixes: 00904aa0cd ("crypto: ccree - fix iv handling")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gilad Ben-Yossef 2019-01-15 15:43:15 +02:00 committed by Greg Kroah-Hartman
parent 009eeb9878
commit 0bdd345a38
1 changed files with 2 additions and 1 deletions
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3
drivers/crypto/ccree/cc_cipher.c
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@ -635,6 +635,8 @@ static void cc_cipher_complete(struct device *dev, void *cc_req, int err)
unsigned int ivsize = crypto_skcipher_ivsize(sk_tfm);
unsigned int len;
cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
switch (ctx_p->cipher_mode) {
case DRV_CIPHER_CBC:
/*
@ -664,7 +666,6 @@ static void cc_cipher_complete(struct device *dev, void *cc_req, int err)
break;
}
cc_unmap_cipher_request(dev, req_ctx, ivsize, src, dst);
kzfree(req_ctx->iv);
skcipher_request_complete(req, err);